• Journal of the Korean Society of Radiology
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• v.13 no.4
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• pp.509-516
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• 2019

In the linear transformation method, the original image is divided into a plurality of range blocks, and a partial transform system for finding an optimal domain block existing in the image for each range block is used to adjust the performance of the compression ratio and the picture quality, The nonlinear transformation method uses only the rotation transformation among eight shuffle transforms. Since the search is performed only in the limited domain block, the coding time is faster than the linear transformation method of searching the domain block for any block in the image, Since the optimal domain block for the range block can not be selected in the image, the performance may be lower than other methods. Therefore, the nonlinear transformation method improves the performance by increasing the approximation degree of the brightness coefficient conversion instead of selecting the optimal domain block, The smaller the size of the block, the higher the PSNR value, The higher the compression ratio is increased groups were quadtree block divided to encode the image at best.

• Journal of Digital Convergence
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• v.17 no.8
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• pp.373-378
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• 2019

In various cultures and civilizations, artists are trying new ideas of reinterpreting the beauty of classic and redefining it in the ways of modern times rather than creating something new. In other words, modern cultural trend is creating a new culture by combining sensibilities of classic amid the flood of information with modern senses of artists. This study tries to combine various cultures an designs in accordance with this cultural change. Based on the features of expressing emotions of individuals and the world of impossible experiences from the short story 'When Buckwheat Flowers Bloom' of Lee Hyoseok, an incomplete area of consciousness which is at the border line of the polarized world divided by existence and absence is the area which creates a new culture by arousing readers' imagination as a potential world of thought. In addition, based on language from the short story, a researcher tries to utilize symbolic and imaginal beauties inside of that language as a material of design, and formative analysis them with the composition of proper words for visualization.

• Journal of Digital Convergence
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• v.17 no.9
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• pp.343-347
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• 2019

As an important branch of decoration of blue and white painting, folk blue and white painting not only has a very long history, but also has a very distinctive folklore and artistry. During the Ming and qing dynasties is an important period, in the development of the folk blue and white painting, the folk craftsmen through long-term study and practice, constantly familiar with drawing technique to master the method, combining folk life form, and folk painting decorative expression aesthetic demand, thus make the painting MinSuXing and artistic expression continuously into the blue and white porcelain painting in the process of development, become an important and indispensable component of ceramic decoration.

• Korean Journal of Heritage: History & Science
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• v.49 no.4
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• pp.156-179
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• 2016

Yatsushiro Shrine on the island of Kamishima located in Ise Bay, Japan, contains many cultural artifacts with ancient mirrors in significant numbers. Also included among the artifacts are horse gags and reins that are clearly of the same lineage as the horse harnesses from the unified Shilla era and Goryeo era in Korean history. Type classification and position establishment were carried out on the horse reins kept in the Yatsushiro shrine, including items such as those mentioned previously. Type A horse harness can be classified into 3 types. Based on this classification scheme, the harness type in the Yatsushiro shrine was found to belong to the most recent period. The blacksmith workshop that made the harness was producing iron wares and bronze wares, and it possessed metal forging and metal casting technologies. Note, however, that it was primarily a workshop where iron wares were made. The parts that were visible from the outside when the harness was attached were made from composite bronze, and the reins and bridle linkage were made from iron. Such integration of bronze ware production techniques and iron ware production techniques was an attempt at enhancing the practicality and embellishments on the harness.

• Journal of Digital Convergence
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• v.17 no.9
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• pp.221-229
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• 2019

The purpose of this study was to identify the relationships between nursing competency and emotional intelligence and nurse role transition of nursing students. Study participants were 134 nursing students of university in Chungnam province. Data were collected with the use of self-administered questionnaires from November 1 to December 10, 2018. Collected data were analyzed using the IBM SPSS 20.0 program. Nurse role transition of nursing students showed positive correlation with nursing competency(r=.79, p<.001) and emotional intelligence(r=.59, p<.001). Factors influencing nurse role transition of nursing students were nursing competency(${\beta}=.66$, p<001) and emotional intelligence(${\beta}=.22$, p=.001), which accounted 67.8%. These results indicate that various educational programs to increase nursing competency and emotional intelligence of nursing students are needed to increase nurse role transition. Studies on the effectiveness of provided programs are also needed to provide more effective programs.

• Composites Research
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• v.32 no.5
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• pp.265-269
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• 2019

The direct spinning of carbon nanotube (CNT) fibers is a promising method in the high performance composite materials. However, most of the reported CNT arrays do not have spinning properties because of their limited synthesis conditions. In this study, we investigate the properties of spinnable CNT arrays, which is closely related to the morphology of CNT array. The array morphology controlled by controlling the conditions of catalyst, carbon source, etc. By additional carbon source of ethylene and changing the composition of the catalyst, the waviness of the CNT array can be remarkably reduced, which leads to improve of the spinning properties. The synthesized CNT arrays were well aligned along c-axis and the synthesis conditions of the spinning array could be derived.

• Membrane Journal
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• v.28 no.6
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• pp.388-394
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• 2018

Carbon nanotube (CNT) based membranes are promising candidates for separation membranes by showing high water transport rate and ion rejection rate according to their radii. The ion selectivity is an important factor to discover the full potential of CNT membranes, and it is affected by the functionalization of CNTs. With multivalent/size ion mixtures, the ion selectivity is affected by not only ion-functional groups interaction but also ion-ion interactions and ion size exclusion in a complex manner. In this study, molecular dynamics simulations are performed to study the ion selectivity of functionalized carbon nanotubes when multivalent/size ions are contained. The permeation energy barriers are calculated by plotting potential of mean force profiles, and various factors, such as CNT size and partial charges, affecting ion selectivity are investigated. The results presented here will be useful for designing CNT membranes for ion separation, biomimetic ion channels, etc.

• Korean Journal of Materials Research
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• v.29 no.1
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• pp.43-51
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• 2019

Nacre of abalone shell features a "brick-and-mortar" microstructure, in which micro-plates of calcium carbonate are bonded by nanometers-thick layers of chitin and proteins. Due to the microstructure and its unique toughening mechanisms, nacre possesses an excellent combination of specific strength, stiffness and toughness. This study deals with the possibility of using nacre fragments obtained from abalone shell for making a bulletproof armor system. A composite plate laminated with abalone shell fragments is made and compression and bend tests are carried out. In addition, a bulletproof test is performed with hybrid armor systems which are composed of an alumina plate, a composite plate, and aramid woven fabric to verify the ballistic performance of nacre. The compressive strength of the composite plate is around 258.3 MPa. The bend strength and modulus of the composite plate decrease according to the plate thickness and are about 149.2 MPa and 50.3 GPa, respectively, for a 4.85 mm thick plate. The hybrid armor system with a planar density of $45.2kg/m^2$, which is composed of an 8 mm thick alumina plate, a 2.4 mm thick composite plate, and 18 layers of aramid woven fabric, satisfy the NIJ Standard 0101.06 : 2008 Armor Type IV. These results show that a composite plate laminated with abalone shell fragments can be used for a bulletproof armor system as an interlayer between ceramic and fabric to decrease the armor system's weight.

• Korean Journal of Materials Research
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• v.29 no.1
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• pp.23-29
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• 2019

Three-dimensional(3D) printing is a process for producing complex-shaped 3D objects by repeatedly stacking thin layers according to digital information designed in 3D structures. 3D printing can be classified based on the method and material of additive manufacturing process. Among the various 3D printing methods, digital light processing is an additive manufacturing technique which can fabricate complex 3D structures with high accuracy. Recently, there have been many efforts to use ceramic material for an additive manufacturing process. Generally, ceramic material shows low processability due to its high hardness and strength. The introduction of additive manufacturing techniques into the fabrication of ceramics will improve the low processability and enable the fabrication of complex shapes and parts. In this study, we synthesize silica composite material that can be applied to digital light processing. The rheological and photopolymeric properties of the synthesized silica composite are investigated in detail. 3D objects are also successfully produced using the silica composite and digital light processing.

• Journal of Digital Convergence
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• v.17 no.1
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• pp.413-421
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• 2019

This study focuses on the mediating effects of the interpersonal problems in the relationship between depression and smartphone addiction of college student living in a dormitory. The subject group was consist of students living in a dormitory among the college students in K city. The final 1,016 questionnaires were used as research data. The data analysis used correlation analysis, regression analysis, and Sobel test. The results showed depression, interpersonal problems and smartphone addiction were significantly correlated, and depression had a direct effect on smartphone addiction. In other words, the higher the level of depression, the higher the level of smartphone addiction of college students. Interpersonal problems was partially mediated between depression and smartphone addiction. Therefore, in order to decrease the level of college student's depression and smartphone addiction, it is necessary to develop and implement a program or counseling that can handle interpersonal problems as one of the strategies that can decrease the level of smartphone addiction. Discussed the use of research results and future research.